I have a Ryzen 3700x with aorus elite x570, I have been chasing 1900 IF 1: 1 stable memory clock for months but without success, it was stable at 3733 unstable at 3800, I tried them all, until, by chance, I disabled the spread spectrum, from that moment the ram at 3800 is stable.
I don't know if...
3733/1866 cl14 on a ryzen 3700X@4350 allcore - aorus elite X570 - DDR4 viper steel 4400
At 3800/1900 latency gets much worse And I still don't understand why.